The disassembling steps of cylinder head are as follows:
1.Remove valve cover.
2.Remove 2 bolts GB/T 5787/ M6x20 fastening the
right cover of cylinder head;
3.Remove the right cylinder head cover and the right
cylinder head cover gasket;
4.Take out the intake and exhaust rocker arm shaft,
intake and exhaust rocker arm, limit plate and camshaft
assembly;
5.Press down the valve spring with the valve remover
and remove the valve lock clip
6.Release the valve remover and remove the valve
spring seat, valve spring and valve
Notes
：
1.In order to prevent the permanent deformation of the
valve spring, the valve spring can not be excessively
compressed, just remove the valve lock clip.
2.All the parts removed should be marked to ensure that
they reach the original assembly position during
assembly.
3.When removing the gasket, ensure that it is in good
condition. If it is damaged, replace it with a new one
during assembly to avoid engine oil leakage.
Inspection of valves and valve springs
Valves and valve springs are checked as follows:
1.Check the valve for bending or abnormal wear of the
valve stem and measure the outside diameter of the
valve stem. Maintenance limit value:
Intake
：
φ4.96mm
Exhaust
：
φ4.94mm
2.Maintenance
limit
value
of
contact
surface
width:1.5mm
3.Check the valve spring for abnormal wear and
measure the free length of the spring:
standard values: outer valve spring 35.55mm
Inner valve spring 32.78 mm
Maintenance limit value:outer valve spring 34.80mm
Inner valve spring 32.03mm
Note:
Valve should be replaced if the valve contact
surface is rough, uneven abrasion or abnormal contact
with the valve seat or cannot guarantee sealing
performance.
Inspection of rocker arm and rocker arm shaft
